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Astron. Astrophys. 335, L81-L84 (1998)

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Letter to the Editor

The LMC distance modulus from Hipparcos RR Lyrae and classical Cepheid data

X. Luri 1, 2, A.E. Gómez 1, J. Torra 2, F. Figueras 2 and M.O. Mennessier 3

1 Observatoire de Paris-Meudon, D.A.S.G.A.L., URA CNRS 335, F-92195 Meudon CEDEX, France
2 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, E-08028, Barcelona, Spain
3 Université Montpellier II, GRAAL, URA CNRS 1368, F-34095 Montpellier CEDEX 5, France

Received 1 August 1997 / Accepted 12 May 1998


The LM method (Luri, Mennessier et al., 1996), designed to exploit the Hipparcos data to obtain luminosity calibrations, is applied to derive luminosity calibrations for RR Lyrae and classical Cepheids. From these calibrations the distance to the Large Magellanic Cloud (LMC) is estimated. The distance moduli provided by the two calibrations are in good agreement, giving a value of [FORMULA], while several previous calibrations using Hipparcos data provided inconsistent results between both types of stars. This result suggest that the Hubble constant should have a value of [FORMULA] km s-1 Mpc- 1.

Key words: LMC – luminosity calibration – RR Lyrae – Cepheids

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© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998